What is functional programming?

Functional programming is a coding approach that creates programs by combining mathematical functions and steers clear of using shared state and mutable data. One of the pioneers in supporting this methodology was Lisp, which was outlined in 1958 and drew inspiration from lambda calculus. In the world of JavaScript, a fundamental programming language, functional programming is a key concept and forms one of the language’s two main pillars. As JavaScript evolved, common functional tools were incorporated in ES5. The core principles revolve around ensuring functions are pure, steering clear of side effects, and facilitating straightforward function composition.


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